Take a look at the influenza virus under a microscope, and you'll see a funny-looking spiked ball. But if you've ever been flat on your back with the flu, you know there's nothing funny about this highly contagious virus. Test your savvy by taking this quiz....more

Nicotine, one of the main chemicals in tobacco, is the primary reason that smoking is so addictive. Even though most smokers know that smoking is bad for them, they find it difficult to quit because of the nicotine's effect....more

Bacterial pneumonia kills thousands of older Americans each year. Yet there is a vaccine that offers protection against
this deadly illness. How much do you know about pneumonia and the vaccine? ...more